AI & the web
HTTP header
A field supplying information about a web request or response.
In everyday use
A response states that the downloaded file is a PDF.
What to keep in mind
Headers describe handling and context; they are separate from the body content.
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Further reading
Original explanation and example by Perspectism. Further reading may cover the wider subject, rather than this exact wording. Edition updated 7 October 2026.
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